Is a mobile phone a blessing or a curse?

Both.

It means that you are always available and can be contacted by your loved ones, and you can contact them. there is no excuse for your teens not to call and tell you they will be late etc.

On the other hand they can also call you at all hours and ask for a lift home rather than get themselves organised before they go.

It's all perspective.

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There's an iphone app to answer that question for you.